3o 



HYDROIDA II 



Lafoeina maxima Lev in sen. 

 1893 Lafoeina maxima, Levinsen, Meduser, Ctenophorer og Hydroider, p. 182, tab. IV, figs. 9—12. 



The colonies form upright, robust rhizocaulomes, often combined with creeping parts, which 

 spread out in plates over the underlayer. The closely set hydrothecse are cylindrical, somewhat irregul- 

 arly bent, with their outer portion nearly perpendicular to the branch axis. The hydrotheca has a 

 conically closing distal portion, exhibiting no distinct limitation from the remaining part of the same. 

 Between the hydrothecse are the nematotheese, which are very numerous, and closely packed; they 

 are slender, cylindrical, somewhat irregularly curved, with a distal, laterally situated oval aperture, in 

 which are some few large nematocysts. 



The gonothecse are wedged in between the nematothecse and the hydrothecoe; they differ neither 

 in form nor in size from the hydrothecse, and their nature can thus as a rule onlv be determined from 

 section preparations. 



Material : 



"Ingolf" St. 29 65°34' N., 54°3i' W.; depth 68 fathoms 0,2° 



- 34 6 5 °i 7 ' N, 54*17' W.; -55 



Holstensborg Harbour — 30 



Greenland : Egedesminde (without further details) 



Store Hellefiskebanke, depth 24 fathoms 



north of Holstensborg ( — — ) 



Holstensborg ( — — — ) 



Godthaab, depth 60—70 fathoms 



Davis Strait — 100 — 



Iceland : Hrutafjord, depth 45 metres. 



Lafoeina maxima is a typical arctic species, belonging to the upper half of the littoral region 

 (fig. IX). The most southerly records of its occurrence are from Godthaab in Greenland, and Hruta- 

 fjord in Iceland; in the Norwegian waters it has hitherto only been met with in Ramfjorden, near 

 Tromso (about 69°3o' N.) 



Gen. Campanulina van Bencden. 



Colonies with sympodial growth and stalked, radially symmetrical hydrothecse. The closing 

 apparatus of the hydrotheca is formed by the distal folding portion of the hydrotheca wall, and goes 

 over into the same without sharp limitation. When folded down, the closing apparatus covers the 

 hydrotheca with a conical lid. The gonothecse differ in appearance from the hydrothecse. 



Kramp, in his exposition (1911 p. 383) merely draws attention to the stalked hydrothecse of 

 the genus as opposed to the sessile in Cuspidclla and Lafoeina. Further, secondary characters are, it 

 would seem, here also to be found in the growth types of the colony, whether stolonial or sympodial. 



Levinsen's 

 type- 

 specimens 



